Geforce Experience is a freaking virus I swear! It kills performance on your entire PC. I never install it anymore. Try using OBS if you want a screen recorder https://obsproject.com and this is a screen of my settings for recording which seems to yield pretty smooth FPS in the 3D viewport:
Not as nice as FRAPS for 3D but useable. FRAPS can’t handle the multiple windows or the right click menus in the editor so OBS wins.